| Revista: | Brazilian journal of chemical engineering |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000308852 |
| ISSN: | 0104-6632 |
| Autors: | Iliuta, I1 Bildea, S.C2 Iliuta, M.C3 Larachi, F |
| Institucions: | 1Laval University, Department of Chemical Engineering, Quebec. Canadá 2University Politehnica of Bucharest, Department of Chemical Engineering, Bucarest. Rumania 3University Politehnica of Bucharest, Department of Applied Physical Chemistry, Bucarest. Rumania |
| Any: | 2002 |
| Període: | Mar |
| Volum: | 19 |
| Número: | 1 |
| Paginació: | 69-88 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental, aplicado |
| Resumen en inglés | Biological removal of nitrogen and carbon by combined nitrification-oxidation in gas-liquid trickle-bed reactors (TBRs) and packed bubble columns (PBCs) was analyzed theoretically using a transient two-dimensional model. The model describes TBR and PBC performances at steady state as well as their transient response to a pulse or step increase in inlet methanol and NH4+-nitrogen concentrations. The hydrodynamic parameters were determined from residence time distribution measurements, using an imperfect pulse method for time-domain analysis of nonideal pulse tracer response. A transient diffusion model of the tracer in the porous particle coupled with the piston-dispersion-exchange model was used to interpret the residence time distribution curves obtained. Gas-liquid mass transfer parameters were determined by a stationary method based on the least-squares fit of the calculated concentration profiles in gas phase to the experimental values. Analysis of steady-state performances showed that under like operating conditions, the TBR outperforms the PBC in terms of conversions. A pulse change in the inlet methanol or NH4+-nitrogen concentration causes a negligible transient change in the outlet methanol concentration and a negligible or high transient change in the outlet NH4+-nitrogen concentration. A step change in the inlet methanol concentration causes the negligible transient change in the methanol outlet concentration and a relatively important transient change in the NH4+-nitrogen outlet concentration. A step increase in the NH4 |
| Disciplines | Química |
| Paraules clau: | Ingeniería química, Biotecnología, Oxidación de carbono, Nitrificación, Reactores de lecho irrigado, Columnas de lecho empacado |
| Keyword: | Chemistry, Chemical engineering, Biotechnology, Carbon oxidation, Nitrification, Trickle bed reactors, Packed bed columns |
| Text complet: | Texto completo (Ver HTML) |
